Fan belt adjustment device



Aug. 20, 1935. D. DUVELSDORF' FAN BELT ADJUSTMENT DEVICE Filed NOV. 12, 1934 in; Z

ATTORNEYS U ITED; STATE f 'BE T-IA i NT ev ce;

J Piedrichjluvelsdorf;"Elisabeth, NzJJjv,

1 =App1ieatinno efiber-i2,1934, Serial Nb. razjz frsfnormally, thus causing the engines cooling water to circulate at a higher degree of temperature. With the above condition of operation in mind Patented Au 20, 1935 a tinent that they be subject to as even a temperature as possible. My device provides means by which the driven speed of the engines cooling fan may be varied for either summer or winter drivingso that during the cooler months the fan will be rotated at a lesser speed than it is the specific object of my invention to provide a simple and efiective means by which the position of the fan belt pulley may be conveniently adjusted to effect the desired change.

A further object of my invention is to provide an adjustment device by which the tension of the fan belt may be accurately adjusted and which,

' after the desired adjustment is attained, may be a line 4'4 of Fig. 2.

securely locked in that position. V

The invention will be fully and comprehensively understood from a consideration of the following detailed description when read in connection with the accompanying drawing which forms part of the application, with the under,-

standing, however, that the improvement is ca-i pable of extended application and is-not confined to the exact showing of the drawing norto the precise construction, described and, therefore, such changes and modifications may be made therein as do not affect the spirit of the invention nor exceed the scope thereof as expressed in the appended claims.

-In the drawing:

Fig.1 is a side elevational view of a typical vehicle engine and the cooling radiator thereof, illustrating the application of my fan belt adjust ment device. 7 i

Fig. 2 is a perspective view of the adjustment mechanism with parts broken away.

2; and a Fig. 4 is a transverse sectional view taken on Referring now to the drawing for a more de-1 tailed description thereof and particularly to Fig.-

' 1, the numeral 5 indicates the typical'combustion engine of the water cooled type which is con- Fig. 3 is a central vertical sectional view of Fig.

nected to the cooling. radiator B-by' the water tube j 1;: Disposed at the rear surface of the radiator 6 is .the cooling fan 8.by which air is drawn thruthe radiator 6 and thrown against the engine 5. 4

"To effect the desired adjustment of the;.speed of cooling fan a8v a cone pulley Sis afiixed to -a shaft, H3 at the forwardend. of which is attached the fan 8. The shaft'lfi is journalled in a-pair of bearings l3, which bearings are supported on a bracket-i i. Cone pulley 9 comprises a plurality of pulleys, I have shown two, each component pulley of which is of suitable diameter with rela I tion to the driving pulley II, so that when the fan 8 is driven by a belt '12 the desired speed of the fan is attained. The setting of the fan drive, as illustrated, is for winter driving-in thatthe'fan belt l2 transmits its power to the larger portion or the pulley 9.. To make the desired adjustment for summer driving, specifically, to increase the speed of the fan 8, the cone pulley 9 is'removed from the shaft l0 and replaced on the, shaft, reversing thepulley 9 end for end so that its smaller section will be in alignment with the drive pul'-' ley H.

To effect this change in the setting of the pulley 9 it is obviously necessary to release'the ten- .sion of the fan belt I 2 and subsequently to readjust same. This is accomplished by the operation of my adjustment device indicated by numeral I5, which, briefly stated, comprises an outer channel member l6 and an inner slide block l1 slidably retained therein, onowhich block the bracket ['4 is integrally formed, and includes means by'which slide block I1 maybe raised or lowered in member l6 and subsequently locked to the desiredposition. The outer channel mem-.

ber- I6 is rigidly mounted in substantially vertical position to the forward end of engine 5 and I has the inner surface 'of its side walls I8. anticli'nedfrom each other, asshown more clearly in Fig. 4. The slide block I! is of U-shaped crossblock I! in member |6a screw rod 20, having its, lower end secured to the end wall l6 of mem ber I6, has its upper end threaded to receive an adjustment nut 2|. The lower portion of nut 2| is'provided with a collar 22 and a circumferential groove 23 'so as toengage in an open slot the rod 20 the vertical adjustment of member I4 is obtained. The locking of the adjustment is eflected by the provision of a set screw 25 which is threadedly engaged with the front wall of block I1 and has its inner end swivelly connected as at 26 to a U-shaped shoe 21. Shoe 21 is prevented from turning at the operation of screw 25 by its engagement with the interior of the walls [9, When screw 25 is turned into block I! the ends of the shoe 2! engage with the rear wall of member l6, thus' wedging the block I! into the synclined interior surface of the member I6.

It is obvious from the drawing that the convenient' adjustment of the tension ofian belt l2 may be easily efiected by the operation of the nut 2 I which adjustment is securely locked when w the set screw 25 is tightened.

What is claimed as new is? l 1. In an adjusting means, an outer member of channel form, an inner member of channel form telescoping and dovetailed with said outer member, a rod secured at one end to said outer member and passing thru and'positioned within said inner member, the latter being slidable relative to said rodand to said outer member, adjustable meansrsecuring said inner member to said rod, and means acting'transversely to said members to prevent relative movement, the last mentioned means comprising a screw threadedly engaging said inner member and a U-shaped shoe loosely mounted on therscrew and straddling said rod and disposed within said inner member and adapted to be pressed against said outer member by turning of said screw.

2. In adjusting means, an outer member of channel form, an inner member of channel form telescoping and dovetailed with said outer member, a rod secured at one end to said outer member and passing thru and positioned within said inner member, the latter being slidable relative to said rod and to said outer member, adjustable I means securing said inner member to said rod,

and means acting transversely to said members to prevent relative movement, the last mentioned means comprising a screw threadedly engaging saidinner member and a U-shaped shoe loosely mounted on the screw and straddling said rod and disposed within said inner member and adapted to be pressed against said outer member by turning of said screw, said rod being threaded and said inner member having an end adjacent said threads, said adjustable means comprising a nut threadedly engaging said rod and having'a groove in which said end of the inner member is disposed.

' 1 DIEDRICI-I DUVELSDORF. 

